Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income			$ 9,751	$ 5,837
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	$ 5,507	$ 5,161	10,975	10,236
Amortization			3,476	5,353
Allowance for doubtful accounts			168	49
Inventory excess and obsolescence reserve			87	(589)
Stock-based compensation expense			2,714	2,588
Loss (gain) on disposal of property, plant and equipment	(520)		(625)	66
Impairment of long-lived assets and (gain) loss on contract	(906)		(2,089)
Deferred compensation			(4,637)	(170)
Non-cash lease expense			2,482
Other non-cash adjustments			176	151
Changes in operating assets and liabilities - net of effects of acquisition:
Accounts receivable			(15,973)	(16,331)
Inventories			(4,033)	(8,984)	$ (39)
Tooling in progress			(1,367)	1,033
Prepaids and other current assets			(1,561)	(1,094)
Accounts payable			9,275	14,324
Deferred income taxes			2,504	1,484
Operating lease obligations			(2,270)
Accrued liabilities			6,631	4,277
Net cash provided by operating activities			15,684	18,230
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property, plant and equipment			(26,351)	(16,986)
Proceeds from sale of property, plant and equipment			5,228	414
Net cash used in investing activities			(21,123)	(16,572)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from bank revolving credit notes			218,867	157,388
Payments on bank revolving credit notes			(210,414)	(158,791)
Repayments of other long-term debt			(547)
Purchase of treasury stock			(2,323)
Payments on finance leases			(157)	(310)
Proceeds from the exercise of stock options				80
Other financing activities				(27)
Net cash provided by (used in) financing activities			5,426	(1,660)
Net decrease in cash and cash equivalents			(13)	(2)
Cash and cash equivalents at beginning of period			118	121	121
Cash and cash equivalents at end of period	$ 105	$ 119	105	119	$ 118
Supplemental disclosure of cash flow information:
Cash paid for interest			999	1,077
Cash paid for taxes			450	716
Non-cash construction in progress in accounts payable			$ 5,633	$ 2,994